Owain Goch ap Gruffydd

Owain Goch ap Gruffydd (1221-1282) was the co-Prince of Gwynedd from 1246 to 1255 with Llywelyn ap Gruffudd, succeeding Dafydd ap Llywelyn and preceding Llywelyn.

Biography
Owaich Goch ap Gruffydd was the oldest son of Gruffudd ap Llywelyn Fawr, and he was imprisoned together with his father at Criccieth Castle in 1239 by his uncle Dafydd ap Llywelyn. Owain later accompanied his father into the captivity of King Henry III of England in the Tower of London, and he was released after his father died in a failed escape attempt in 1244; King Henry hoped that Owain Goch's release would lead to a civil war in Wales. However, Dafydd's death led to Owain's brother Llywelyn ap Gruffudd becoming Prince, and Owain became co-ruler of Gwynedd alongside his brother. In 1255, Owain Goch allied with his brother Dafydd ap Gruffydd against Llywelyn, hoping to seize power. However, the two brothers were defeated by Llywelyn at Bryn Derwin in June 1255. He was imprisoned in 1277, and he was released under the terms of the Treaty of Aberconwy. He died in 1282.